How we build our invisible libraries Erich Auerbach wrote his classic work Mimesis, a history of narrative from Homer to Proust, based largely on his memory of past reading. Having left his physical library behind when he fled to Istanbul to escape the Nazis, he was forced to rely on the invisible library of his mind. Each of us has such a library-if not as extensive as Auerbach's-even if we are unaware of it. In this erudite and provocative book, William Marx explores our invisible libraries-how we build them and how we should expand them. Libraries, Marx tells us, are mental realities, and, conversely, our minds are libraries. We never read books apart from other texts. We take them from mental shelves filled with a variety of works that help us understand what we are reading. And yet the libraries in our mind are not always what they should be. The selection on our mental shelves-often referred to as canon, heritage, patrimony, or tradition-needs to be modified and expanded. Our intangible libraries should incorporate what Marx calls the dark matter of literature: the works that have been lost, that exist only in fragments, that have been repurposed by their authors, or were never written in the first place. Marx suggests methods for recovering this missing literature, but he also warns us that adding new titles to our libraries is not enough. We must also adopt a new attitude, one that honors the diversity and otherness of literary works. We must shed our preconceptions and build within ourselves a mental world library.